Sound-reproducing device



April 2, 1929. J. B. ELE NSCHNEIDER SOUND REPRODUCING DEVICE Filed Dec. 12, 1925 INVENTOR.

' A TTORNEYS.

- 45 upstanding Patented A r. 2. 1929.

3 UNITED STATES" 1. .ATE T v OFFICE.

' J JOHN i3. mniv scnnmnnn,

-' contrn'nm'or RSEY CITY, NEW JERSEY, A CORPORATION or DELAWARE.

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Application filed December-12,1925. scrim m. 74,952.

This invention relates to a sound reproducing device.

The general object of this invention is to provide improvements in sound reproduc- 5 ing devices.

This invention relates in general to sound reproducing devices of the type used ;in public address systems, radio broadcasting reception, and uses of a similar nature.

One of the specific objects of this invention is to provide a sound reproducing device in which the vibrations of the membrane are prevented from reaching the supporting framework.

provide a. sound reproducing device which is simple and easy to construct, eflicient in operation, and easy to maintain in adjustment. g

The invention resides substantially .in the construction, arrangement and relative locationof parts as willbe more fully hereinafter ointed out.

'Referring to the drawings, in which the same reference numerals will be used throughout the several figures to indicate the same parts, Fig. 1 is a side elevational view of my invention. 1

Fig. 2 is a rear-elevational view of my device, and

Fig. 3 is a detailed sectional view of the method of supporting the vibrating membrane, taken on the line 3-3, looking in the direction of the arrows.

In providing sound reproducing devices, one of the most difficult problems to be overcome has been to find a means of supporting the membrane without having it set in 40 vibration when the device is working. Such vibrations are, of course, disastrous to proper reproduction. Iha-ve, therefore, provided a simple method of overcoming this difliculty.

The base 1, 1s provided with an integrally rojection 2, to which is secured a ring mem er 3, having supported thereon a central ring shaped member 5, by means of radial arms 4. Mounted within the ring 5,

is the vibrating means 6, having a volume adjusting means 7 This controls the vibrating mechanism. On the front face of the ring 3, is secured a clamping ring 8,

v by means of machine screws 9, which extend through ring 3 into ring 8. On the mar- 'Another object of this invention is toginal edge of. the vibrating membrane 10,

is securely glued a narrow strip of linen or fabric 12. This membrane is clamped between two felt rings 11, b means of the ring 8. .At membrane, I have provided short slots '14, which allow the ring to be clamped between the rings without wrinkling. I also provide near the marginal'edge of themembrane 10, a series of holes 13, which extend also through the linen vor fabric 12. The center of the membrane is. attached to the vibrating "device 6 by means of a short rod 15, and

clamping device'16.

It will be seen by the foregoing description, that I have provided a vibratile membrane which, while clamped rigidly within the framework, is rendered more flexible by means of slots and holes which permit the membrane to vibrate freely without transmitting these vibrations to the supporting framework. a

While I have shown my improvement as intervals aroun the edgeof the O1 BROOKLYN, NEW YORK ASSIGNOR TO DE FOREST RADIO applied to sound reproducing devices of the cone type, I of course, realize that this idea could be utilized in connection with many other types of sound reproducing devices,

and I therefore do not wish to be limited to devices of the type illustrated in the drawings, but rather to all devices which come within thespirit and scope of my invention,

as defined in theap'pended claims.

' Having now set forth the objects and nature of my invention and having shown and described a structure embodying the principles thereof, what I claim as new and useful and of my own invention, and desire to secure by Letters Patent is:

1. A vibratile membrane having a reinforced marginal dge with holes extending .through said membrane and marginal edge,

and having radial slits in its marginal edge said slits'lying betweenthe holes.

2. A tympanu'm comprising a diaphragm, a reinforced'marginal edge, and a plurality of holes and slits in said tympanum and said reinforced marginal edge said slits lying between the holes.

3. A cone shaped tympanum having rigidly secured to its free edge a strip of fabric,

said free edge having a plurality of holes.

and slits through said edge and fabric said slits lying between the holes.

4. In a sound reproducing device, a base,

15 a reinforced edge with holes and a ring shaped supporton said base, a plurality of radially extending arms on said' ring, vibrating means mounted on said arms, a diaphragm having a reinforced edge with a plurality of holes and slits through said diaphragm reinforced edge, a binding member, said diaphragm being clamped between said ring shaped support and saidsbinding member, and said vibrating means 'being secured to said membrane. Y 7

5. A sound reproducing device comprising a support, vibrating means, a diaphragm mounted on said support and secured to said vibrating means, said diaphragm having slits through said diaphragm and its reinforced edge said slits lying between said holes.

6. A diaphragm having a substantial area and an annular ring of reinforcing material attached to the marginal edge of the diaphragm with a series of holes through the diaphragm and reinforcing material, and extending along the entire reinforced marginal edge whereby the diaphragm is substantially free for vibration when supported at its marginal edge. Y

In testimony whereof I have hereunto set my hand on this 20th A. D. 1925.

JOHN B. ELENSCHNEIDER.

day of November, 

